Our guide Pheap made it an unforgettable experience, he gave us so much information about the places we were visiting, but also about the Cambodian history and daily life!
The Lingas and order sculptures in the river bed were very interesting, and add an added bonus, you can see one of the several pure water springs that feed the river - the water spews upwards from a limestone pool and it's perfectly clear! You can see many locals coming to fill out their bottles, as the water is both drinkable and considered holy.
The waterfall is the main event, and it was spectacular! The cool water was well received in the heat of March (perfect time to visit, as the river will be too wild once the rainy season starts). As an added bonus, the pool at the best of the waterfall was full of those tiny fish that come and nibble at your dead skin - an expensive treatment in other places, completely free here!
* One unusual thing to be aware of, is that after the trip is done, the organizers will take you to a restaurant to have lunch - this meal is not included in the trip (in fact the prices were on the high side compared to Siem Reap). The food is tasty and freshly made, but you're kinda forced to eat there, as there are no other options in the place where you stop. So if you can't afford the food or simply don't want to eat there, all you can do is wait for everyone else to finish their meals, before the van drives everyone back to the city.